Trocar



(No Model.)

S.`B.BAKBR.

TROOAR.

No. 564.581- Patented July 28,-1896.'

UNITED STATES- PATENT OFFICE.

SOIPIO E. BAKER, OF SPRINGFIELD, OHIO.

TROCAR.

SPECIFICATION forming part of Letters Patent No. 564,581, dated July 28,1896.

Appnmion ined Marchas, 1896;

Serial No. 585,174. (No model.)

To a/ZZ whom it may concern:

Be it known that I, ScIPIo E. BAKER, a citizen of the UnitedStates,residing at Springfield, in the county of Clark and State ofOhio, have invented certain new and useful Improvements in Trocars, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to certain new and useful improvements introcars.

The objects of my invention are (a) to so construct the tip of my trocarthat it may be readily inserted into the flesh and removed therefromwithout tearing the flesh and without being deflected from the line inwhich it is inserted, and (b) to prevent the passage in the trocar frombecoming clogged.

In the accompanying drawings, on which like reference-letters indicatecorresponding parts, Figure l is a perspective view of my improvedtrocar entire; Fig. 2, a longitudinal sectional view of the same; Fig.3, a detail perspective view of the trocar point, and Fig. 4 a sectionalview'on the line a; of Fig. 3.

The letter A represents a vulcanized rubber tube which snugly incases ametallic tubular core or lining B, formed of brass orv other suitablemetal. The lower end of this metallic tube or core is preferablyscrewthreaded, as shown in section in Fig. 2. Upon the screw-threadedend of this core is screwed an arrow or spear tip O, made ofhighly-teinpered steel or other suitable metal. This tip has twodiverging cutting-edges d and b. From these edges and the point of thetip the metal gradually thickens until it becomes the same in diameteras the body of the trocar, thus forming a raised portion on each side ofthe tip, and which is greatest along a central line c and d, midwaybetween the cuttingedges. The cutting-edges are tapered out until theyextend considerably beyond the body of the instrument, and then theytaper back. in a slightly-curved line preferably not wider than the bodyitself. Thus no matter whether the trocar is inserted into the flesh orwithdrawn therefrom there is no possibility of tearing the flesh, asthere are no irregularities to come in contact with it. Then again bythickening my tip in the manner shown from either side ofthecutting-edges to the center, as also from the point of the tip alongthese lines, (shown at c d,) the tip is stiffened and consequently willnot be deflected from the line in which it is inserted when the flesh orviscera is pierced, as is the case where a simple cutting-blade is used.It will also be seen that a hole D extends through the tip. This holeconnects with a passage E, drilled or otherwise formed in the upperportion of the tip. A part of this passage is preferably screw-threaded,as shown at F, to screw onto the lower end of the tubular core B. Whenthis tip is screwed into place, it snugly fits against the rubber tubeA, and the tip being the same size eXteriorly as the tube, a smoothjoint is formed. It will also be understood that the tip may be solderedor otherwise secured to the core B instead of being screwed thereon. Insomecases also the tip and body of the trocar may be formed of one solidpiece of metal. When this is the case, no inner tubular core isnecessary.

In order to prevent the hole or opening D in the tip from becomingfilled or clogged when inserted into the body of a person, and forcleaning the core, I provide a plunger G, which fits the core and islong enough to extend into the tip and close the opening therein.

In using my trocar it is inserted into the flesh or viscera to theposition desired, such as into the heart or other organs, for embalmingpurposes. The plunger is removed and a pump or aspirator connected toits outer end by a rubber tube or other suitable means. The trocar isthen turned about one-fourth of a revolution, which spreads the fleshaway from the hole on each side of the tip and allows the blood or gasesto be freely drawn out, and also allows the embalming fluid to bereadily pumped into the body.

With all of the trocars now on the market the openings become easilyclosed and require much time in keeping them open, so that the blood maybe removed or the embalming fluid pumped in. This difficulty I haveovercome by my improved construction.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

l. In a trocar, a tip consisting of a fiat pointed portion and a tubularportion, and having. a transverse opening in the flat 'por- IOO providedwith diverging euttingedges, a transverse Opening and an interiorcavity, whereby the tip is widened to hold the flesh away from theopening by partially rotating the troear, and whereby communication isestablished from the interior of the orifice to the interior of theincision.

In testimony whereof I aiix my signature in presence of two Witnesses.

SCIPIO E. BAKER. Ttnesses EDWIN L. ARTHUR, W. M. MCNAIR.

